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Appearance
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Colorless crystals or a white, crystalline powder
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Assay (on dried basis)
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99.0 - 100.5%
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Solubility
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Freely soluble in water, very soluble in boiling water, practically insoluble in alcohol
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Identifications
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To comply IP, BP, USP tests
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Appearance of solution
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To comply IP, BP, USP tests
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pH (5% solution in water)
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5.0 - 9.2
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Acidity or alkalinity
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To comply IP, BP test
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Chloride (Cl)
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Max. 0.014%
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Heavy metal (as Pb)
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Max. 0.001%
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Arsenic (As)
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Max 0.0002%
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Iron (Fe)
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Max 0.002%
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Selenium (Se)
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Max 0.003%
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Loss on drying (at 450°C)
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48.0 - 52.0%
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